Machine for straightening twist-drills.



No. 720,215.l A PATENTBD FEB. 1U, 1903.

R. L. BARGLAY. MACHINE FOR STRAIGHTENING TWIST DRILLS.

APPLIoATIoN FILED JUNE 19. 1902.

No Momma. s SHEETS-SHEET 1.

. ...,rl/.w .-.l u, v m.

H In

mmm oo u Nf5.'/2o,215. y PATENTED FEB. 1o; 190s. R. L. BARGLAY;

MACHINE POR STRAIGHTENING TWIST DRILLS.

APPLIGATION FILED JUNE 19, 1902. y Ho MODEL. 2 SHEETS-SHEET 2.

wnNEss'Ese INVENTOR rl IT A mml ATTO UNITED STATES PATENT OFFICE.

ROBERT L. BARCLAY, OF BROOKLYN, NEW YORK.

MACHINE FOR STRAIGHTENING TWIST-DRILLS.

SEECIFICATION forming part of Letters Patent N o. 720,215, dated February 10, 1903,

Application led June 19| 1902. Serial No. 112,297. (No model.)

To @ZZ whom t may concern,.-

Beit known that 1, ROBERT L. BARCLAY, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, and city and State of New York, have invented certain new and useful Improvements in Machines for StraighteningTwist-Drills,of which the following is a specification.

After a twist-drill has been twisted it requires to be straightened and trued up, and the present invention relates to a machine for effecting this object.

The invention has for its object to provide a machine for the purpose which shall be simple and effectiveY and which is adapted to drills of differentdiameters and provided with shanks of different sizes and shapes. The machine also has special means for feeding in and extracting the drill.

In the accompanying drawings, which serve to illustrate an embodiment ot the invention, Figure 1 is a plan of thev machine. Fig. 2 is a side elevation thereof. Fig. 3 is an end View with the feeding devicefin transverse section at line x3 in Fig. 1. Fig. 4 is atransverse section at :n4 in Fig. 1. Fig. 5 is a View of the feeding device detached. Fig. 6 shows one of the straightening-rolls detached. Fig. 7 includes a side and end view of the rollersleeve forstraighteningthedrill-shank.- Fig.8 includes a side'and end View of the nut for securing the said sleeve on the straighteningroll. Fig. 9 shows different forms of drill- Shanks.

For a better understanding of the invention it may be stated primarily that the machine comprises three straightening-rolls arranged in the form of a triangle and geared together, so that when one is driven they all rotate.A The drill is forced shank first into the triangular space between the rolls, which latter bear on and roll it asit is fed in. There are removable sleeves which form that part of the rolls which roll and straighten the drillshank, and a screw device is provided for forcing in and withdrawing the drill.

1 is the bed-plate, and 2 2 2 are the three straightening rolls, mounted.` relatively in bearing-blocks 3,1ixed on the bed-plate.

4 is a driving-shaft having on it a pulley 5 and a pinion 6, which gears with a spur-wheel 7. This wheel 7 is on a shaft 8,'and on this to the drill.

such directions as to impart a rolling motion The two lower rollers are mounted in ixed bearings,- that is, they are not adjustable; but the upper roller is mounted in sliding blocks 11, which are adapted to play up and down in guideways in the respective fixed bearing-blocks 3. Mounted in the fixed block 3 is a rock-shaft 12, provided with a han- ',dle 13, which I nay engage a forked guide 14 on the bed-plate.' On the shaft 12 are two eccentries 15, occupying slots in the blocks 3 above- `and over the sliding blocks 11. These eccentrics are embraced each between a cap 16 and a distancing-plate 17, which rests on the top of the block 11, and two bolts 18,which pass through the cap 16 and are set in the block 11, hold the parts together. By using thinner or'thicker plates 17 the upper roller may be adjusted up or down to suit the diameter of the drill to be straightened, and by rotating the shaft 12 the upper straightening roller may be lifted a little, soas to free the straightened drill from pressure and allow it to be drawnrout easily. There may be a pin 19 in the forked guide 14 to hold the arm or handle 13 against flying up.

For feeding in and withdrawing the drill the mechanism now'to be described is elnployed.

Extending out from the end of the bed-plate (at the left in Figs. 1 and 2) is a. trough-like support 20 for the drill, and at the outer end of this support is a nut 21, through which screws av feed-screw 22, having a crank or hand-wheel 23. This screw is alined with the drill, and at its inner end it has a bearing (see Fig. 5) in an upright whichA forms part of a carriage 24. Collared rotatively on the end of thescrew 22 is a bearing-piece 25 to interpose between the screw and the drill D. On thej extreme inner end of the carriage 24 is an upright extractor 26 to engage thedrill and draw it out.

So far as described the operation is as follows: The screw 22, drawing with it the carriage 24, is run back or out to the full extent,

IOO

and the drill to be straightened is placed in the trough or guide 2O in front of the bearing piece or pusher 25, as indicated in Fig. 5. The machine is now set in motion and the drill forced or fed into the bite of the rolls,

the movement being longitudinally of the latter. When the drill shall have been fed or pushed into the position indicated in Fig. 2, where the drill is seen in dotted lines, the screw is reversed and the drill drawn out, the extractor 25 engaging the end of the shank thereof. To relieve the pressure on the drill while it is being extracted, the handle 13 may be thrown up or raised, so as to slightly elevate the upper roll.

In drills having the saine diameter the shanks thereof sometimes differ in diameter and form, as indicated in Fig. 9-that is, the tapered shank d may be as large as the body at the point where it merges into the same, or it may be of less diameter than the body at this point, or it may be without taper. These three forms are shown in Fig. 9. To accommodate the machine to such variations in the drill-shank, that part of the roll (see Figs. G, 7, and 8) which straightens the shank is made in the form of a removable sleeve 2X, which is slipped onto the part 2 of the roller and held against rotation by a key 2b on the roller, which engages a keyway in the sleeve. A nut 2c is screwed onto the roller to hold the sleeve in place. Obviously sleeves of different kindsor contours to suit the difference in the Shanks may be fitted on the rolls. Where the shank is of larger diameter than the body of the drill, as is sometimes the case, the feeding devices shown cannot be employed. In this case the drill is fed in sidewise before the machine is started by elevating the upper straightening-roll. When the drill is in place, the machine is started and pressure is put upon the drill by means of the handle 13, and the upper roll is gradually pressed down until the drill is straightened. The limited movement of the movable roll toward and from the two other rolls is not sufficient to disengage the teeth of the driving-gears which connect the rolls for simultaneous rotation. It is not essential that the rolls be all of the same diameter, but they should have the same peripheral speed.

Vhile the machine described is especially designed for straightening and rolling twistdrills, it may be utilized for straightening and rolling other small tools having a general circular cross-section.

Having thus described my invention, I claiml. Amachineforthepurposespecied,com prising a set of straightening-rolls having each a removable sleeve which forms the part of the roll that operates on the drill-shank, and means for driving said rolls.

2. Amachineforthepurposespeciied,com prising a set of straightening-rolls, having each a removable sleeve which forms the part of the roll that operates on the drill-shank, means for driving said rolls, and means for moving one roll of the set from the others.

3. Amachineforthepurposespecied,com prising a set of three straightening-rolls each having that portion which operates on the drill-shank readily removable for interchanging, means for rotating said rolls simultaneously and at a uniform rate, means for moving one of said rolls from the others, and means for adjusting the rolls to operate on drills having dierent diameters.

4. Amachineforthepurposespecied,com prising two rolls rotatable in fixed bearings, one roll parallel with the other two and rotatable in movable bearings, means for moving the last-named roll toward and from the other two, means for driving the rolls, and means for feeding the drills endwise into the bite of the rolls and for extracting the same.

5. A machine for the pu rpose specified,com prising straightening-rolls, means for driving the same, a support 2O for the drill to be fed, means for feeding the drill into the rolls, comprising the nut 2l, the screw 22, and the end piece 25, rotative on the screw, and means for extracting the drill, comprising the carriage 24, coupled to the feed-screw and provided with the extractor 26, substantially as set forth.

In witness whereof I have hereunto signed my name, this 18th day of June, 1902, in the presence of two subscribing witnesses.

ROBERT L. BARCLAY.

Witnesses:

HENRY CoNNE'rT, PETER A. Ross. 

